<!DOCTYPE html> 
<html lang="en"> 
<head> 
<meta charset="UTF-8"> 
<meta name="viewport" content="width=device-width, initial-scale=1.0"> 
<title>示例18</title> 
<script> 
  // 计算传入数据的平均值 
  function avg(...values) { 
  let sum = 0; 
  for (var val of values) { 
  sum += val; 
  } 
  return sum / values.length; 
  } 
   let result = avg(1, 2, 3) 
   console.log(result); // 2 
   </script> 
    
 </head> 
 <body></body> 
 </html> 